drivers/input/keyboard/newtonkbd.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Copyright (c) 2000 Justin Cormack
   4  */
   5
   6 /*
   7  * Newton keyboard driver for Linux
   8  */
   9
  10 /*
  11  */
  12
  13 #include <linux/slab.h>
  14 #include <linux/module.h>
  15 #include <linux/input.h>
  16 #include <linux/serio.h>
  17
  18 #define DRIVER_DESC     "Newton keyboard driver"
  19
  20 MODULE_AUTHOR("Justin Cormack <j.cormack@doc.ic.ac.uk>");
  21 MODULE_DESCRIPTION(DRIVER_DESC);
  22 MODULE_LICENSE("GPL");
  23
  24 #define NKBD_KEY        0x7f
  25 #define NKBD_PRESS      0x80
  26
  27 static unsigned char nkbd_keycode[128] = {
  28         KEY_A, KEY_S, KEY_D, KEY_F, KEY_H, KEY_G, KEY_Z, KEY_X,
  29         KEY_C, KEY_V, 0, KEY_B, KEY_Q, KEY_W, KEY_E, KEY_R,
  30         KEY_Y, KEY_T, KEY_1, KEY_2, KEY_3, KEY_4, KEY_6, KEY_5,
  31         KEY_EQUAL, KEY_9, KEY_7, KEY_MINUS, KEY_8, KEY_0, KEY_RIGHTBRACE, KEY_O,
  32         KEY_U, KEY_LEFTBRACE, KEY_I, KEY_P, KEY_ENTER, KEY_L, KEY_J, KEY_APOSTROPHE,
  33         KEY_K, KEY_SEMICOLON, KEY_BACKSLASH, KEY_COMMA, KEY_SLASH, KEY_N, KEY_M, KEY_DOT,
  34         KEY_TAB, KEY_SPACE, KEY_GRAVE, KEY_DELETE, 0, 0, 0, KEY_LEFTMETA,
  35         KEY_LEFTSHIFT, KEY_CAPSLOCK, KEY_LEFTALT, KEY_LEFTCTRL, KEY_RIGHTSHIFT, 0, 0, 0,
  36         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  37         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  38         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  39         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  40         KEY_LEFT, KEY_RIGHT, KEY_DOWN, KEY_UP, 0
  41 };
  42
  43 struct nkbd {
  44         unsigned char keycode[128];
  45         struct input_dev *dev;
  46         struct serio *serio;
  47         char phys[32];
  48 };
  49
  50 static irqreturn_t nkbd_interrupt(struct serio *serio,
  51                 unsigned char data, unsigned int flags)
  52 {
  53         struct nkbd *nkbd = serio_get_drvdata(serio);
  54
  55         /* invalid scan codes are probably the init sequence, so we ignore them */
  56         if (nkbd->keycode[data & NKBD_KEY]) {
  57                 input_report_key(nkbd->dev, nkbd->keycode[data & NKBD_KEY], data & NKBD_PRESS);
  58                 input_sync(nkbd->dev);
  59         }
  60
  61         else if (data == 0xe7) /* end of init sequence */
  62                 printk(KERN_INFO "input: %s on %s\n", nkbd->dev->name, serio->phys);
  63         return IRQ_HANDLED;
  64
  65 }
  66
  67 static int nkbd_connect(struct serio *serio, struct serio_driver *drv)
  68 {
  69         struct nkbd *nkbd;
  70         struct input_dev *input_dev;
  71         int err = -ENOMEM;
  72         int i;
  73
  74         nkbd = kzalloc(sizeof(struct nkbd), GFP_KERNEL);
  75         input_dev = input_allocate_device();
  76         if (!nkbd || !input_dev)
  77                 goto fail1;
  78
  79         nkbd->serio = serio;
  80         nkbd->dev = input_dev;
  81         snprintf(nkbd->phys, sizeof(nkbd->phys), "%s/input0", serio->phys);
  82         memcpy(nkbd->keycode, nkbd_keycode, sizeof(nkbd->keycode));
  83
  84         input_dev->name = "Newton Keyboard";
  85         input_dev->phys = nkbd->phys;
  86         input_dev->id.bustype = BUS_RS232;
  87         input_dev->id.vendor = SERIO_NEWTON;
  88         input_dev->id.product = 0x0001;
  89         input_dev->id.version = 0x0100;
  90         input_dev->dev.parent = &serio->dev;
  91
  92         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
  93         input_dev->keycode = nkbd->keycode;
  94         input_dev->keycodesize = sizeof(unsigned char);
  95         input_dev->keycodemax = ARRAY_SIZE(nkbd_keycode);
  96         for (i = 0; i < 128; i++)
  97                 set_bit(nkbd->keycode[i], input_dev->keybit);
  98         clear_bit(0, input_dev->keybit);
  99
 100         serio_set_drvdata(serio, nkbd);
 101
 102         err = serio_open(serio, drv);
 103         if (err)
 104                 goto fail2;
 105
 106         err = input_register_device(nkbd->dev);
 107         if (err)
 108                 goto fail3;
 109
 110         return 0;
 111
 112  fail3: serio_close(serio);
 113  fail2: serio_set_drvdata(serio, NULL);
 114  fail1: input_free_device(input_dev);
 115         kfree(nkbd);
 116         return err;
 117 }
 118
 119 static void nkbd_disconnect(struct serio *serio)
 120 {
 121         struct nkbd *nkbd = serio_get_drvdata(serio);
 122
 123         serio_close(serio);
 124         serio_set_drvdata(serio, NULL);
 125         input_unregister_device(nkbd->dev);
 126         kfree(nkbd);
 127 }
 128
 129 static const struct serio_device_id nkbd_serio_ids[] = {
 130         {
 131                 .type   = SERIO_RS232,
 132                 .proto  = SERIO_NEWTON,
 133                 .id     = SERIO_ANY,
 134                 .extra  = SERIO_ANY,
 135         },
 136         { 0 }
 137 };
 138
 139 MODULE_DEVICE_TABLE(serio, nkbd_serio_ids);
 140
 141 static struct serio_driver nkbd_drv = {
 142         .driver         = {
 143                 .name   = "newtonkbd",
 144         },
 145         .description    = DRIVER_DESC,
 146         .id_table       = nkbd_serio_ids,
 147         .interrupt      = nkbd_interrupt,
 148         .connect        = nkbd_connect,
 149         .disconnect     = nkbd_disconnect,
 150 };
 151
 152 module_serio_driver(nkbd_drv);